How much power are you pushing through your coils?
How long is it taking to get burned?
Are you running in temp control or power mode?
What build are your coils?
I typically run either a quad core ss- 30g Clapton with 40g surround. 6 wraps with an internal diameter of 3mm. In dual coil that’s around a 0.15-0.16. I push them around 75-80w and the cotton will show some scoring or singing after about 2 days of heavy use. If I run them in temp control mode it’ll take much longer.
That’s also assuming I use my typical lighter colored juices. If I use a dark juice they’ll look pretty ragged after a day.